Steam boiler



1360- 1929 c. F. CLEMENS ET AL STEAM BOILER Filed 001:. 28. 1927 till Patented Dec. 10, 1929 n lED STATES PATENT OFFICE otannnon r. CLEMENS Ann ALBERT n. names, or DAYTON, OHIO STEAM BOILER This invention relates to improvements in steam boilers of the general character of the boiler set forth in our copending application for patent Serial No. 187,835, filed April 30, 1927.

ilhe accompanying drawing serves for illustrating the improved boiler in a preferred construction.

The objects attained in the invention consist in a boiler having relatively large steam generating capacity, including capacity for a service or storage head of dry steam, the boilor being of the vertical, flueless type, simply constructed with all parts conveniently accessible.

1n the arrangement of the boiler as herein shown and described, provision is made for attaining maximum consumption of fuel gases and for effecting fuel economy, the boiler being adapted for using coal as fuel.

Low maintenance cost and long service life of the boiler are attained by entire elimination oi? water tubes and feed water heaters and injectors or pumps, the feed water flowing entirely by gravity to the boiler, being heated direct as it passes through the heating chamber of the boiler.

A feature of the boiler consists in means provided for introducing pre-heated air into the combustion chamber for effecting more complete combustion of fuel gases and according y minimizing fuel waste through the smoke pipe. To this end also means are provided in the heating chamber for indirect passage of smoke to the smoke outlet which is materially helpful in effecting more complete combustion, the arrangement in this respect being an improvement of the sotllQCl smokeless boiler.

its shown in the drawing, the apparatus consists in two units, the boiler 1 and feed water tank 2, the boiler structure consisting in an outer casing 3, provided in the lower portion of the combustion chamber 18 with a grate 1, of any suitable construction accord ing to the fuel to be used.

jacket 5 is arranged around casing 3, being spaced laterally from, the casing for forming a shallow air space 6 between the ,.o:.t and. casing in which the air is pre- Application filed. October 28, 1927; Serial No. 229,452.

heated as it passes through the space and a series of apertures or ports 7 in casing 3 into the combustion chamber, the jacket being open at the bottom for movement of air to the ports. The movement of air through space 6 being directly over casing 3, it will be seen that the air will be heated before it enters the combustion chamber" and that combustion of fuel gases in the chamber will be accordingly facilitated. The circulation of cool air through the lower end of jacket 5 has the fur tl eretl'ect of preventing or resisting burning out of the outer casing 3 adjacent the grate. Insulating material 6 between the upper portion of the jacket and the heating chamber casing serves for minimizing heat radiation above ports 7, thus aiding materially in effecting fuel economy, the air space 6 below the ports having a. similar effect.

The water chamber casing 8 is suspended in the combustion chamber from a flange ring 9 which forms part of the removable boiler head structure 9-10. A steam chamber 11 and a secondary water chamber 12 are sup ported in water chamber 8, part 12 being provided with feet 13 which serve for supporting the same on the bottom of chamber 8, part 11 being provided with an apertured flange ring 14 which serves for supporting the same on part 12 and for permitting free movement of water between chambers 812. By removing the head parts 910, parts 8, 11 and 12 can be removed separately from casing 3.

A series of diaphragms 15, two as here shown are supported in the upper portion of the combustion chamber, the same being, spaced vertically one from the other and apertured as indicated at 16, thus forming an indirect passage for smoke from the combustion chamber to the smoke outlet. lhis arrangement serves for elfecting a more complete combustion of fuel gases and for minimizing the heat and unconsumed gases that pass through the outlet 17 The casing 11 is provided near its upper end with a series of apertures 20 which serve for admitting steam at the highest point in the boiler to the steam chamber and thence to the serving line 21, and line 22 for providing steam pressure in the feed water tank 2, a branch 23 of line 22 being connected to the lower portion of the tank for flushing the tank with steam at times for cleaning it out, a plug 24 in the feed water line 25 to the boiler being provided for the same purpose.

The boiler is provided with theusual blowotf outlet 26 and pop valve 27, the inner end of the blow-ofl pipe 28 being extended through anaperture 29 in the bottom casing 12 which has the effect of causing pronounced action of the steam and water, in blowingoff the boiler, on scale or sediment accumu lated in the bottom of te water casings 812 with the result that much of it is blown out "through pipe 28.

\Ve claim as our invention:

A boiler including in combination with a vertical combustion chamber, a jacket arranged around the' combustion chamber and spaced therefrom, terminating at its lower end'near the base of said chamber, open to the atmosphere at said lower end, and terminating near the normal water level of the a boiler at its upper end, for effecting a shallow air space between the jacket and the combustion chamber, the upper portion of said space being closed and insulated, the combustion chamber casing having a series of circumferentially extended apertures therein below the insulation for admitting pre-heated air from said space into said chamber.

- In testimony whereof we aflix oursignatures. 1

CLARENCE F. CLEMENS. ALBERT H. KEMPER. 

